Origin of thirtyLate Middle English thirti, metathetic for thritti ; from Old English thritig ; from thri, three + -tig, -ty
- the cardinal number between twenty-nine and thirty-one; 30; XXX
Origin of thirtyprob. orig. telegraphers' code for a concluding sentence this number used to signify the end of a dispatch, story, etc., as for a newspaper
- The cardinal number equal to 3 × 10.
- thirtiesa. A decade or the numbers from 30 to 39: They settled down in their thirties. The temperature fell into the thirties.b. often Thirties The decade from 30 to 39 in a century.
- An indication of the end of a news story, usually written 30.
- Sports The second point that is scored by one side in tennis.
Origin of thirtyMiddle English thritty, thirty, from Old English thrītig; see trei- in Indo-European roots.
- thirtieth (ordinal number)
- (slang) A rack of thirty beers.
From Middle English thirty, metathetic alternant of Middle English thritti, þrittiȝ, from Old English þritiġ (“thirty”), from Proto-Germanic *þrīz tigiwiz (“thrity”, literally “three tens”), equivalent to three + -ty. Cognate with Scots therty, tretty (“thirty”), West Frisian tritich (“thrity”), Dutch dertig (“thrity”), German dreißig (“thirty”).